Rename wast to wat

tests/compiler/recursive.optimized.wat

@@ -0,0 +1,31 @@
+(module
+ (type $ii (func (param i32) (result i32)))
+ (memory $0 1)
+ (export "fib" (func $recursive/fib))
+ (export "memory" (memory $0))
+ (func $recursive/fib (; 0 ;) (type $ii) (param $0 i32) (result i32)
+  (if
+   (i32.le_s
+    (get_local $0)
+    (i32.const 1)
+   )
+   (return
+    (i32.const 1)
+   )
+  )
+  (i32.add
+   (call $recursive/fib
+    (i32.sub
+     (get_local $0)
+     (i32.const 1)
+    )
+   )
+   (call $recursive/fib
+    (i32.sub
+     (get_local $0)
+     (i32.const 2)
+    )
+   )
+  )
+ )
+)